Good question Daniel,
I have asked myself that very question but then the first time I tried to sand without washing all the crap off first was an indicator on a larger scale what I would be up against and I didn't like the prospect.
The mold and mildew makes for some quick clogging of the sandpaper.
Now, I realize that doing the job right the first time is key but sometimes one just needs to do it twice as the second time is purely just for the removal of all the dirt and debris from the sanding process and ensuring the surface is properly prepped.
Wash/strip/neutralize the wood, sand, then wash the wood again with a percarbonate/neutralize, buff then seal.
Works like a charm.
Some may consider this to be reducing profits but that is an assumption. The pricing has to be in line with the work in order to keep it profitable.
Obviously this is calculated accordingly. The following is for those who are curious...
Wash/Strip/Neutralize= $xxx (sqft)
Sanding= $xxx (sqft/hr+materials and rental)
Percarb wash= $xxx (sqft-% [for less difficulty])
Buffing= $xxx
Seal = $xxx
Yes, we do get customers to pay for all this, they are willing to do so because the potential of having it reskinned vs sanding is more expensive.
The motivator is small children and alleviation of splinters for all.
Rod!~